refactor: replace extract code with sanity schema library

[binoy14]

Description

Replaces duplicate code with @sanity/schema/_internal

What to review

Anything I miss

Testing

Existing tests should suffice

[claude]

Claude finished @binoy14's task in 1m 29s —— View job

---

Code Review

• Gather context and read changed files
• Analyze diff for issues
• Post review findings

---

Two files were missed that still import from deleted extractWorkspaceManifest.ts:

1. deployStudioSchemasAndManifests.worker.ts:6,38 — broken import (runtime crash)

import {extractWorkspaceManifest} from '../manifest/extractWorkspaceManifest.js'
// ...
const workspaceManifests = await extractWorkspaceManifest(workspaces, workDir)

extractWorkspaceManifest.ts was deleted in this PR but this file still imports from it. Needs to be migrated to use extractCreateWorkspaceManifest from @sanity/schema/_internal the same way extractManifest.worker.ts was updated.

2. extractSanityWorkspace.worker.ts:6 — broken import (runtime crash)

import {extractManifestSchemaTypes} from '../manifest/extractWorkspaceManifest.js'

Same issue — extractWorkspaceManifest.ts is gone. If extractManifestSchemaTypes is available from @sanity/schema/_internal, it should be imported from there. If not, this function needs an equivalent replacement.

3. deployStudioSchemasAndManifests.worker.ts:7 — type import from cleaned-up types.ts

import {type CreateWorkspaceManifest} from '../manifest/types.js'

CreateWorkspaceManifest was removed from types.ts in this PR. This import needs to be updated to @sanity/schema/_internal (same as writeWorkspaceFiles.ts was updated).

4. _internal.ts — breaking change

extractManifestSchemaTypes was a public export from @sanity/cli/src/exports/_internal.ts. Removing it without a major version bump or deprecation notice may break external consumers.

5. list.ts:70-72 — redundant empty string check

if (flags.id === '') {
  errors.push('id argument is empty')
}
const id = flags.id ? parseWorkspaceSchemaId(flags.id, errors)?.schemaId : undefined

The flags.id === '' check is redundant — the ternary on the next line already handles the falsy case ('' is falsy). The error will be pushed but id becomes undefined, and then errors.length > 0 exits. This works but the explicit check is dead-guarding. Fix this →